Grate.



Patented lan. I, l90l.

H'. AfsPEA-n.

G R A T E.

(Application led Apr. 5, 1900.`

I l E'. l- 3 2 Sheets-Sheet l.

(No Model.)

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Patented l1an. I, l90l.

H. A.,sPEAn. GRATE.

(Application led Apr. 5, 1900., (No Model.) 2 'Sheets-Sheet .2

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By 7M raten.

HENRY A. SPEAR, OF EVERETT, MASSACHUSETTS.

GRATE.

SPECIFICATION forming' part of Letters Patent No. 665,278, dated January 1, 1901.

Application filed April 5, 1900. Serial No. 11,7442. \l\|o modem' made for shakingthe fuel-supporting bars or sections thereof. Usually in such grates a a large numberofcastings are required for the formation of the parts composing the same, and this has been one of the serious disadvantages incident to the employment of such grates, occasioning, as it does, great inconvenience in repairing or renewing the wornout parts thereof and entailing an increased cost of manufacture and renovation.

The primary object of the present invention is to simplify grates of the character referred to and at the same time provide a construction and arrangement of parts wherein the proper amount of oxygen-bearing atmosphere is admitted to all of the parts of the fire-bed to promote combustion and insure the economic consumption of the coal.

Referring to the drawings, which illustrate one embodiment of the present invention7 Figure 1 represents in plan View a grate constructed in accordance with my said invention. Fig. 2 represents a section through the same to illustrate the mechanism for rocking the grate-bars. dinal section on the line 3 3 of Fig. 1 looking in the direction of the arrow. Fig. 4t represents in side elevation one of the grate-bars. Fig. 5 represents the end or linger bar of the frame surrounding the rocking sections or grate-bars. Fig. 6 represents a detail perspective View of the interlocking ends of two of the bars, said figure representing said bars in solid lines as separated from each other, the dotted-line position of one of the bars indicating the relative positions of the two Ybars when set in position for use.

I have not illustrated a boiler-furnace, as it seems unnecessary so to do, in pointing out the features of my present invention; but it will be understood that my improved grate may be used in any pattern or type of boilerfurnace.

Fig. 3 represents a longitu-:`

The front and rear walls of the fire-box (the rear wall not being shown and the front wall being indicated as ot in Fig. 2) are each provided with an iron bar b, and upon these said bars rest the ends of longitudinal bars c. These said bars are preferably of cast metal, and they are arranged in pairs, as shown in Fig. l, each pair being utilized to support a plurality of grate-bars. Said bars o have a straight upper edge and a curved lower edge, whereby they taper from the center to the ends,and they are provided with laterally-projecting fingers or ribs c', arranged at suitable equal distances from each other. Thus the lingers or ribs project from one side only, and the bars are arranged with the fingers extending outward, so that the two intermediate bars when placed together have their lingers coincident, as shown in Fig. 1. When two sections comprising the longitudinal or side bars c c and the end bars h h are placed together, as shown in Fig. 1, the coinciding fingers or ribs c', which project laterally from the adjacent bars c, form spaces between them for the passage of the proper amount of oxygenbearing atmosphere, as hereinbefore stated.

. To support them between their ends,the outer bars are provided with lips c2, which project into spaces left in the brick walls at the sides of the {ire-box, while the two inner bars are not provided with these lips, but are apertured to receive bolts c3, (see Fig. 3,) and a supporting rod or strut c4 is passed under said bolts and is bent at its ends over the iron bars b, whereby said intermediate bars are likewise supported between their ends. The

tops of the said longitudinal bars are recessed, as at c5, to form bearings for the trunnions d d' ofthe rocking grate-bars d. Said gratebars are quadrangular. in plan View, being oblong in shape and provided with parallel bars d2, connected at intervals, as at d3. These grate-bars d d are supported upon the longitudinal bars c at points far enough apart to permit them to rock without interfering with each other. They may be as many in number as may be desired, although I usually employ from six to eight, this depending, of course, upon the size of the ire chamber or box.

Each of the grate-bars is provided at one end with a downwardlyprojecting arm d4,

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and saidarms are all pivotally connected by studs d5 With a rocking bar f, which projects through an aperture in the front wall a and is pivot-ally connected to a lever g,whose lower end is connected by a stud g with a link g2, pivoted at g3 to a bracket g4, supported upon the front face of the wall ct. The lever g is provided with a handle or with means by which it maybe rocked about its fulcrum for the purpose of swinging the grate-bars about the axes of their trunnions. The two sets of grate-bars are independent of each other,each being provided with a shaking bar j'.

At the front and rear ends of the grate there are cross-bars h,which are provided along one side with lateral lingers h. These bars may be so arranged that their fingers project inward toward the front and rear side of the grate-bars, or else said fingers may project outward. At their ends said cross-bars are provided with flanges or ribs h2, which project into rabbeted portions of the longitudinal bars c,said last-mentioned bars being likewise provided with lips c6, which take under the lower edges of the said cross-bars, asindicated in Fig. 6.

Thus it will be seen that the grate is practically formed in two sections, divisible along the median line, said sections being duplicates of each other. Each section consists of the side bars c c and the end bars t 7L, which form a frame to inclose the rocking grate-bars d. There maybe as many of these sections as are necessary, and instead of having two, as I have shown, there maybe three, four, or more. Each section requires but three sets of castings-to wit, the grate-bars, the side bars, and the end or cross bars. The side bars are iirmly braced and held against lateral movement at their ends by the crossbars, which latter are held against inward movement or movement toward each other by the rabbeted portions at the ends of the side bal-sc. It will thus be understood that a grate-surface of any desired extent may be built up by means of the sections composed of the bars described, with little or no interference with the proper supply of oxygenbearing atmosphere by the bars which define the edges of each section, this being due to the provision of the spaces between the coinciding laterally and outwardly projecting ngers c'.

By the provision of oblong grate-bars which are arranged to tilt or rock on trunnions at their ends the lire may be dumped into the ash-pit with little trouble instead of drawing it through the door, as ordinarily. This not only avoids the free dissemination of dust from the ashes, but permits retaining the steam at a uniform pressure.

Having thus explained the nature of the invention and described a way of constructing and using the same, although without attempting to set forth all of the forms in which it may be made o1' all of the modes of its use, I declare that what I claim isl. A grate comprising rocking grate-bars, side bars in which said rocking grate-bars are trunnioned, said side bars being provided with laterally and outwardly projecting fingers or ribs, and end or cross bars which brace and separate the ends of the said side bars, said cross or end bars being provided with laterally-projecting fingers or ribs, the fingers or ribs of the adjacent side bars coinciding with each other to form air-spaces, substantially as described.

2. A grate comprising a plurality of similar sections, each section consisting of side bars supported at their ends, independent end bars separating and bracing the ends of the side bars, and rocking grate-bars trunnioned upon the said side bars, said end and side bars being provided with laterally-projecting ribs or lingers, the fingers or ribs of the adjacent side bars coinciding with each other to form air-spaces, substantially as described.

3. A grate comprising side bars supported at their ends, said ends beingl rabbeted, end bars having lips or flanges projecting into the rabbeted portions at the ends of the side bars, said side bars being also provided with lips or ribs to take under the ends of the end bars, and rocking grate-bars trunnioned in the said side bars and occupying the space between the end bars, the side bars having laterally and outwardly projecting fingers or `ribs coinciding with each other to form airspaces between the adjacent side bars, substantially described.

4. A grate comprising a plurality of rocking grate-bars, independent end bars, and side bars, said side and end bars beinglocked together at their ends, and said side bars being supported between their ends, the side bars having laterally and outwardly projecting fingers or ribs coinciding with eachother to form air-spaces between the adjacent side bars, substantially as described.

In testimonywhereof I have affixed my signature in presence of two witnesses.

HENRY A. SPEAR.

Witnesses:

R. M. PIERSON, C. F. BROWN.

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